Narrator: This is Science Today. Current federal guidelines for physical activity recommend getting thirty minutes of moderate activity on a daily basis. But Scientist Paul Williams of the Lawrence Berkeley National Laboratory says the recommended activities, which include cleaning your house, are not enough.
Williams: And we certainly disagree this is where the majority of the health benefits come from. Our data, looking at runners who run anywhere from very little to over 100 miles per week, show that thereís significant health benefits to adding more exercise.
Narrator: These benefits include lower incidences of heart disease and half the rate of hypertension and high cholesterol.
Williams: Certainly dietary consciousness is important - watching the composition of your diet, the total calories you consume, but I think the key here may be physical activity. And we would like to especially emphasize vigorous activity such as running and a little bit of exercise gives a little bit of benefit, a lot of exercise gives a lot of benefit.
Narrator: For Science Today, Iím Larissa Branin.